(idiomatic) To be careful or cautious; to pay attention to what one is doing (usually imperative).

plural of watchfulness

On duty as a guard or lookout / Vigilant; alert.

The act of one who watches.

present participle of watch

plural of watching

(idiomatic) To guard and protect.

A period of monitoring of someone, especially a prisoner deemed likely to commit suicide, to ensure they do not attempt suicide.

(chemistry) An item of glass laboratory equipment consisting of a simple, slightly concave circle of glass. It is a general utility item, used to hold small samples, to evaporate liquids, to cover a beaker, and so on.

Alternative form of watchnight